The government have released some more papers as a result of a freedom of information request.
They're heavily redacted and from March 2023.
This one's the most informative...
It describes the trial run of the randomised ESA/UC reassessments they performed last year and sets out a plan to reassess all LCW claims first before moving on to 'top up' those referrals with short prognosis LCWRA/Support Group claims.
Another interesting detail is they've switched off the automatic system which refers claimants for a WCA based on their prognosis length so as of now award durations are meaningless and they're talking about creating a new 'prioritisation mechanism'.
Of course this is nearly a year old and a lot of water has passed under the bridge since then so who knows what's going on now.